The Herald of Sharon reports the incident happened about 7:30 a.m. Wednesday as students were arriving at Monsignor Geno Monti School in Farrell, about 60 miles northwest of Pittsburgh.
Principal Alice Connelly says there was "blood all over" because the deer cut itself on the way into the school.
Lawrence Hergenroeder, a wildlife conservation officer for the game commission, says the deer likely saw its reflection in a glass window and darted toward it, smashing into the school. He says the deer had to be destroyed beneath a school stairwell because it lost so much blood.
